Quantitative fish and benthic community surveys of the reefs of Malakula Island, Vanuatu

Replicate line and belt transects of various sizes were used to estimate densities of several groups of marine organisms around Malakula and associated islands in Vanuatu in 1988.

The eight sites chosen for surveys were located at Atchin Island, Crab Bay, Port Sandwich (Lamap), Metai Island (Maskelyne Islands), south east, south and north west of Sakao Island (Maskelyne Islands) and Cook Bay (Maskelyne Islands).

Corals, seagrass and other sessile benthic organisms were assessed using 20m line intersect transects. Each site was subdivided into a number of habitats (reef flat, reef crest, shallow slope and deep slope) and five replicate transects were positioned haphazardly within each of these habitats. Reef crests and slopes were surveyed on SCUBA while reef flats were surveyed on snorkel.

Permanent transects were established on the south east side of Sakao Island.

Invertebrate food and commercial resource species (various Holothurian species, clams (Tridacnidae), Trochus niloticus and Turbo marmoratus (green snail)) were also surveyed. Five (10 in some instances) haphazard 50x5m belt transects were used to survey these species in both the reef crest and reef slope habitats.

Selected species of fish were quantified using 50x10m belt transect visual counts. Fish surveyed included , large non-secretive cods and coral trout (Serranidae); snappers or sea perch ( Lutjanidae); sweetlips (Haemulidae); emperors (Lethrinidae); butterflyfishes (Chaetodontidae); large wrasses (Labridae); and parrotfishes (Scaridae).